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Priority claimed from JP1308331Aexternal-prioritypatent/JPH0768483B2/ja
Priority claimed from JP1308330Aexternal-prioritypatent/JPH0768482B2/ja
Priority claimed from JP1308329Aexternal-prioritypatent/JPH0768481B2/ja
Application filed by Canon KkfiledCriticalCanon Kk
Priority claimed from EP19890124087external-prioritypatent/EP0441987B1/de
Application grantedgrantedCritical
Publication of ATE105312T1publicationCriticalpatent/ATE105312T1/de